java下载文章为markdown文件

    /**
     * 导出
     * @param response
     */

    @GetMapping("/export")
    @Operation(summary = "导出文章")
    @Parameter(in= ParameterIn.HEADER,name="token",description = "token")
    public void export(@RequestParam("id") Long id,@RequestParam("ext") String ext,HttpServletResponse response){
        try {
            Article article = articleService.getById(id);
            OutputStream outputStream = response.getOutputStream();
            if(ext.equals("md")) {
                // 设置响应头
                response.setContentType("text/markdown");
                response.setHeader("Content-Disposition", "attachment; filename=output.md");
                // 写入文件内容
                outputStream.write(article.getContent().getBytes());
            }else{
                ResponseResult result = ResponseResult.errorResult(400,"不支持的导出格式");
                WebUtils.renderString(response, JSON.toJSONString(result));
                return;
            }
            response.setCharacterEncoding("utf-8");
            outputStream.flush();
            outputStream.close();
        } catch (Exception e) {
            //如果出现异常也要响应json
            ResponseResult result = ResponseResult.errorResult(AppHttpCodeEnum.SYSTEM_ERROR);
            WebUtils.renderString(response, JSON.toJSONString(result));
        }
    }
}